Seodity is an SEO toolkit offering keyword research, competitor analysis, content generation with AI, rank tracking and backlink checking. Plans have monthly limits covering projects, tracked keywords, audits and AI articles.
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SeoTools for Excel is an Excel add-in for online marketing and SEO work, offering over 100 functions for tasks such as on-page and off-page analysis, plus connectors for services including Google Analytics and Majestic. It also includes a spider that crawls a list of URLs or a root URL.
SERanking tracks rankings, SERP visibility, and keyword performance across search results.
Serp Miner helps research keywords, search demand, related terms, and content opportunities for SEO.
SerpApi tracks rankings, SERP visibility, and keyword performance across search results.
SerpBear is an open source search engine position tracking app. It tracks a website's keyword positions in Google and sends email notifications about position changes. It uses third-party scrapers or proxy IPs to scrape Google search results, with Basic, Custom and Smart scrape strategies. A built-in API supports reporting tools, and Google Ads and Search Console integrations are available.
Serplux is an AI SEO tracker for search engine automation. It offers AI agents for SEO strategy, content ideas, competition analysis, keyword position tracking and UX review. The page states a free forever plan with no credit card and access to all AI agents.
SERPrecon is an SEO and GEO tool that reads search results and AI answers to diagnose whether content, intent or authority is limiting a page across Google, ChatGPT and Perplexity. It offers page reports with an Action Plan, content scoring before publishing, and Share of Voice tracking. A 7-day free trial is offered without a payment method.
SerpWatch is an SEO rank tracking tool for marketers and agencies. It tracks keyword rankings, sends rank-drop notifications, and includes client management, white-label client portals, report building and a local rank tracker. Pricing is based on monthly keyword checks, with plans from $29 to $199 per month billed annually.
ShellCheck is an open source static analysis tool that automatically finds bugs in shell scripts. It is written in Haskell, licensed under GPLv3, and can be installed locally via cabal, apt, dnf, pkg or brew. A web page allows pasting a script to view its output.
Sherlock is a web3 security platform that combines private audits, audit contests, AI-assisted analysis and bug bounties. It describes an audit engine that coordinates AI security approaches into one validated result, and collaborative audits staffed by security researchers. The site states it has conducted over 1,000 audits and reports more than 11,000 security researchers.
Browse indexed datasets and documentation for research and secondary analysis.
Sigma.js is a WebGL-powered JavaScript library for interactive graph visualization, built on graphology. It provides GPU-accelerated rendering, built-in pan, zoom, hover and multi-touch interactions, and works with React, Angular, Vue or vanilla JavaScript. Layouts, metrics and community detection come via graphology's standard library.
Similarweb tracks rankings, SERP visibility, and keyword performance across search results.
Siteliner tracks rankings, SERP visibility, and keyword performance across search results.
Estimates a Twitter user’s likely sleep schedule from posting times and activity patterns.
Analyzes structured data and helps produce queries, insights or visualizations.
SmallSEOTools is a collection of free SEO tools for checking backlinks, tracking keyword positions and more. It groups text analysis, image editing, keyword, backlink, website management, tracking, domain and meta tag tools. A separate paid plan covers plagiarism checking, image search and related features.
Snowpixel is a creative studio for generating AI videos, music, sound effects, images, and 3D objects from prompts and source media. It offers text-to-video, image-to-video, AI music, text-to-3D, and still generation within one workspace. Credit packs start at $10 USD for 50 credits and $45 USD for 250 credits.
Twitter analytics tool for searching, filtering, and measuring tweets, users, and hashtags.
Solana News is the official news and updates hub for the Solana network. It publishes ecosystem and developer updates, DeFi coverage, institutional adoption stories, and community news from across the network, alongside posts on upgrades, payments and events.
A free, open-source application for Windows, Linux and Mac that views and analyses the contents of music audio files. It offers configurable visualisation, analysis and annotation of recordings and is aimed at musicologists, archivists and signal-processing researchers.
Sourcely is an AI-powered academic source finder that searches over 200 million papers based on pasted text, an essay, or a paper. It finds and summarizes credible sources and exports citations. Advanced filters, deep search, and chatting with sources are offered. Plans are billed monthly or annually.
SoyBase is a collaborative community resource that integrates genetic, genomic, and trait data across legume species to support crop improvement. It provides analysis, search, sequence, visualization, and genome browsing tools for soybean breeders and researchers. The site is funded by USDA-ARS and developed with the National Center for Genome Resources.